In database management, business-critical integrity constraints enforce a company's rules. For example, a company can code a constraint that prevents a checkout counter from giving a customer a ...

Check constraints are supported in all of the major DBMS products, including DB2, Oracle, and SQL Server. But they are too-often ignored and not implemented in production databases. Properly defined, ...

In particular, I often look up constraints in SQL*Plus. In this post, I look at the Oracle database views and queries that I use most to get an idea what constraints I am dealing with.

Want to improve the integrity of your data? Place constraints in the database, as well as in your application. NoSQL, the catchall phrase for non-relational databases, is all the rage among Web ...